Unequal signal form dual receive in KX3

[Ignacy]

With dual receive, my KX3 has different gains from VFO A and B. This is easily heard when switching pressing A/B. When in dual receive, a weak station in VFO B may disappear as VFO B.

I do not hear this in K3. When A/B switching, the signals just change sides.
 
Any workaround?

Ignacy, NO9E